Linux OS Editors Question:

Which command will delete all the blank lines in file old.txt?
a) sed '/d' old.txt
b) sed '/^/d' old.txt
c) sed '/^$/d' old.txt
d) sed '/^*/d' old.txt

Linux Editors Interview Question
Linux Editors Interview Question

Answer:

c) sed '/^$/d' old.txt


Previous QuestionNext Question
The command "sed -n '/google/p' old.txt" will:
a) print the lines containing the word 'google' in file old.txt
b) delete the lines containing the word 'google' in file old.txt
c) will generate an error message
d) none of the mentioned		Which command is used to replace word 'cat' (already present in the file) with 'mouse' at all places in a file 'old.txt' and save the result in a new file 'new.txt'?
a) sed 's/cat/mouce/g' old.txt > new.txt
b) sed 's/cat/mouse' old.txt new.txt
c) sed '/s/cat/mouse/g' old.txt new.txt
d) sed '/s/cat/mouse' old.txt > new.txt